Merge pull request #1766 from taosdata/hotfix/rpcSid

if connection is not activated, create a new one even sid is not 0

src/rpc/src/rpcMain.c

@@ -643,10 +643,11 @@ static SRpcConn *rpcGetConnObj(SRpcInfo *pRpc, int sid, SRecvInfo *pRecv) {
 
   if (sid) {
     pConn = pRpc->connList + sid;
-  } else {
-    pConn = rpcAllocateServerConn(pRpc, pRecv);
+    if (pConn->user[0] == 0) pConn = NULL;
   } 
 
+  if (pConn == NULL) pConn = rpcAllocateServerConn(pRpc, pRecv);
+
   if (pConn) {
     if (pConn->linkUid != pHead->linkUid) {
       tTrace("%s %p, linkUid:0x%x not matched, received:0x%x", pRpc->label, pConn, pConn->linkUid, pHead->linkUid);